This document summarizes inter-process communication methods including message passing and shared memory. It describes synchronous and asynchronous message passing. Synchronous message passing requires the sender and receiver to wait for the message transfer, while asynchronous message passing allows the sender to continue without waiting for the receiver. The document also discusses direct communication by explicitly naming the receiving process and indirect communication using mailboxes.

1. VMKV ARTS & SCIENCE
College
SCIENCE DAY
CELEBRATION

3. SUBMITTED BY
K.TAMILSELVAN
B.SC COMPUTER SCIENCE
2ND YEAR

4. INTER-PROCESS COMMUNICATION
MESSAGE PASSING COMMUNICTION
SYNCHRONOUS MESSAGE PASSING
ASYNCHRONOUS MESSAGE PASSING

5. INTER-PROCESS COMMUNICATION
When Messages Are Passed Between Two Different Processes We
Speak Of Inter-process Communication.
Message Is A Block Of Information.
 Communication May Be Of Two Types.
1. Message Passing.
2. Shared Memory.

6. Message Passing
• MESSAGE has a predefined structure.
• Message passing uses two system calls:
1Send(name of destination process, message);
2 Receive(name of source process , message);

7. Send Message passing

8. Receive Message passing

9. MESSAGE PASSING COMMUNICTION
Mesaage passing communication may be of two types.
• 1. Direct communication: Explicitly name the process you are communicating with.
2. Indirect communication: communicate using mailboxes owned by receiver.

10. Direct communication

11. Indirect communication

12. SYNCHRONOUS MESSAGE PASSING
Synchronous message passing: requires the sender and receiver to wait for
each other to transfer the message.
• Blocking send.
• Blocking receive

13. Blocking send

14. Blocking receive

15. Asynchronous message passing
Delivers A Message From Sender To Receiver, Without Waiting For A Receiver To Be Ready.
• Non Blocking Send .
• Non Blocking Receive.

16. Non Blocking Send

17. Non Blocking Receive

18. Conclusion
COMMUNICATION LINK ARE POSSIBLE THROUGH MAILBOX
• One-to-one link
• Many-to-one link
• One-to-many link
• Many-to-many link